No Evidence for a Relationship between Intelligence and Ejaculate Quality

No Evidence for a Relationship between Intelligence and Ejaculate Quality. Tara DeLecce, Bernhard Fink, Todd K. Shackelford, Mohaned G. Abed [in press, Evolutionary Psychology, September 2020]. http://www.toddkshackelford.com/downloads/Delecce-et-al-EP-sept.pdf

Abstract: Genetic quality may be expressed through many traits simultaneously, and this would suggest a phenotype-wide fitness factor. In humans, intelligence has been positively associated with several potential indicators of genetic quality, including ejaculate quality. We conducted a conceptual replication of one such study (Arden, Gottfredson, Miller, & Pierce, 2009) by investigating the relationship between intelligence (assessed by the Raven Advanced Progressive Matrices Test – Short Form) and ejaculate quality (indexed by sperm count, sperm concentration, and sperm motility) in a sample of 41 men (ages ranging 18 to 33 years; M = 23.33; SD = 3.60). By self-report, participants had not had a vasectomy, and had never sought infertility treatment. We controlled for several covariates known to affect ejaculate quality (e.g., abstinence duration before providing an ejaculate) and found no statistically significant relationship between intelligence and ejaculate quality; our findings, therefore, do not match those of Arden, Gottfredson, Miller, and Pierce (2009) or those of previous studies. We discuss limitations of this study and the general research area and highlight the need for future research in this area, especially the need for larger data sets to address questions around phenotypic quality and ejaculate quality.

Check also No Evidence for a Tradeoff between Competitive Traits and Ejaculate Quality in Humans. Tara DeLecce, Todd K. Shackelford, Bernhard Fink, Mohaned G. Abed. [in press, Evolutionary Psychology, June 2020]. https://www.bipartisanalliance.com/2020/07/no-evidence-for-tradeoff-between.html